Apparatus for uniting wax paper



Dec. 19, 1933. s, MCORE l 1,949,561

APPARATUS FOR UNITING vWAX PAPER Original Filed March 16. 1932 2 Sheets-Sheet l1 gmc/Wto@ Dm., 19,1933., 's MOQRE y y 1,940,561

AFPARATUS FOR UNITING WAX PAPER Original Filed March 16. 1932 2 Sheets-Sheet 2 In carrying out my invention, I have found that by the proper application of heat without the use of pressure to the edges or seams of paper previously waxed or coated with a moistureproof material, may be readily united and a suniciently strong seal or bond established that will permit the bags so formed to be employed for general use. Such waxed coated paper should be substituted for the roll 2 of the ordinary uncoated paper and the web of wax coa'ted paper is first supplied with a suitable paste or adhesive along its longitudinal edges by means of the paste applying roll indicated by the numeral 4 upon the drawings. The tube so formed with the adhesive thereupon passes between the heaters 1l and \12 whereupon the wax or other coating upon the paper is first melted to liquid form and the glue placed thereupon permitted to flow into contact withthe paper. By the continual and simultaneous application of heat, the cells or pores of the paper have a tendency to expand whereupon the adhesive can be more readily absorbed by the fibers thereof especially in the absence of pressure and thus enhance the strength of adherence. The heaters 11 and 12 being relatively long permit of the application of heat to the paper for a relatively long period of time, whereupon by this continual application of heat to the adhesive, the moisture contained in the latter is more readily evaporated and the adhesive permitted to set in a relatively short period of time. As the web of paper progresses beyond the heaters 11 and 12, it will readily begin to cool, whereupon the wax so melted about the bond or seal made will congeal, thereby effecting a moistureproof seal about the connected edges of the paper. In order to effect a similar seal between one of the open ends of each bag section and permit of the proper application of heat, I preferably mount within the outer periphery of lthe packing cylinder 9, the heaters 13. Each one of these heaters 13 is so arranged and the packing cylinder so timed that a heater 13 will come in contact with that end of the bag to be sealed and stays in contact with such end of the bag until the packing cylinder has made one-half of a complete revolution, which is of sufficient time to permit first of the melting of the wax at that point of the bag to which the second or end seal is to be effected, permitting the paste which has been applied to that end of the bag by the paste applying apparatus 7 to come in contact with the paper and subsequently, by the continual application of heat to the paper, the pores thereof will expand or the fibers thereof separated in order that the adhesive will be more readily absorbed and as the paper bag so formed leaves the packing cylinder, it will be permitted to cool whereupon the wax which has been previously melted, will congeal so as to establish a moistureproof coating about the seal so made. By applying heat and without applying pressure to the wax coated papers as they pass betewen the heaters 11 and 12 or in contact with the heater 13 in the manner aforesaid, I have found that a truly moistureproof bag is formed with sealed joints of greater strength than that of the paper so employed in the making of the bags.

Whereas the heaters as shown in the accompanying drawings are supplied with,- electrical energy, it is, of course, to be understood that heat derived from gas, -chemicals, steam, heated water, or other liquids, may be used. While the Lemmer degree or intensity of heat necessary to effect uniting or sealing varies with the amount of wax or other coating material which has been applied to the paper from which the bags are formed, the requisite and proper intensity may be secured by any common or well known method of controlling the electrical current or other heating medium. These heaters are each formed from a tube 14 preferably made from copper. The length and width, together with the thickness of the tube, may be varied to meet the particular requirements of the type of bag to be manufactured, or the type of bag making ma.- chine used, as well as the heating element employed. Positioned within the tube 14 is a resistance coil 15 which is bent upon itself, the two sections thus formed are separated by an asbestos partition 16 and the electrical energy is supplied to this element 15 through the conductors 17. Surrounding this element 15 and positioned within' each tube, is an envelope of asbestos 18, whereas the opposite ends of the tube are closed by suitable sealing material 19. The heaters 13 are of the same outer contour asv the heater 12 and these heaters 13 are each fastened within a suitable transversely extending channel or recess 20 formed within the outer periphery of the packing cylinder 9. 'I'he heaters 13, as illustrated in Figure l of the drawings, are arranged diametrically opposite within the outer periphery of the packing cylinder 9 so that when the cylinder is revolved, one heater contacts the bottom fold or seam of the bag, the heat therefrom penetrates and heats the adhesive which has been previously applied to the edges of the paper en-'.

abling it to perform the uniting and sealing operation. For certain types of bag making machines, this operation is completed on two bags simultaneously and in order to accommodate this simultaneous operation, two heaters are herein shown.

In Figure 3 of the drawings, I have shown the conductors 17 which lead to the heater 13 as being in contact with the conductor rings 21 secured upon an extension of the cylinder 9 and -these conductor rings 21 are electrically connected by means of the conductors 21 to a suitable source of electrical energy herein indicated by the numeral 22. Electrically arranged within the conductors 21 is a rheostat 23 or other suit- 1".

able control, whereby the flow of current to the element within the heater 13 may be controlled so that the proper temperature may be automatically or manually maintained.

The heater 12 is supported upon the bed plate 24 of the bag making machine and held in proper position by means of the clamps 25. The upper heater 11 has secured to one end thereof, a bracket 26 and this bracket 26 is adjustably connected by means ofthe set screw 27 to the frame 1 of the bag making machine, whereas the opposite end'of this heater 11 is curved or bent upwardly as at 28. The bent or free end 28 of this heater 11 permits the web of paper which is to be formed into bags to readily pass between the heaters 11 and 12 and the vertical adjustment of this heater 11 may be readily established in order to cause the same to be retained in proper position above the seams of the paper web, which are to be sealed together.

The web of paper, as it leaves the former is folded upon itself in the shape, of a tube, as is better illustrated in Figure 4 of the drawings, and the overlapping longitudinal edges of the paper form a seam which is to be secured together with means of the adhesive 29. This adhesive has been applied to the paper as it passes over the paste supplying roll 4 and the paper ing and sealing operation heretofore described,

will be completed. As the folded over end 30 of each bag section illustrated in Figure 5 comes in contact with a heater 13, the heat so generated will perform a similar action upon this end of the bag to be sealed, as when the longitudinal seam passes between the heaters 11 and 12 in order, at this point or end of the bag, the proper sealing and uniting will be effected. That portion of the paper having the adhesive thereon as it comes in contact with the heaters 11, 12 or 13 is not subjected to pressure as is apparent from Figures 4 and 5 of the drawings, nor is pressure desired during either sealing operation.

The application of the invention heretofore described is not limited to bags in which the opposite edges thereof consist of a single fold, orn which one end is folded onto an adjoining portion of the bag structure to close the same, but may be employed in the manufacture of bags of any other of the known types of structures. For example, the invention may be employed to manufacture a bag wherein the opposite edges thereof consist'of two or more pleats or folds, and also may be employed in the manufacture of bags in which the bottom and top ends thereof are or may be closed, in an altogether different manner from that described, by the application of heat to the adhesive and paper atthe proper and necessary point of adherence. It is also to be understood that the method and apparatus herein shown and described are not 1imited for use in connection with paper bag making but the same may be employed for uniting any paper or fabric having an adhesive repellant coating thereupon.

Manifestly, the construction herein shown is capable of considerable modification. and such modifications as come within the scope of my claims, I consider within the spirit of my invention.

I claimz- 1. The combination with a paper bag making machine having means for overlapping the longitudinal edges of the paper, a heater mounted upon the paper bag making machine, and 4said heater extending longitudinally with the overlapping edges of the paper and disposed to merely touch the same whereby the overlapping edges of the paper may be united without the application of pressure.

2. The combination with a paper bag making machine having means for overlapping the edges ofthe paper as it passes through the niachine, of heaters supported by. said machine and said heaters being arranged on the opposite side of the overlapping edges of the paper as the latter passes through the machine.

3. The combination with a paper bag making machine having means for overlapping the edges of the paper as it passes through said machine, of a heater xedly mounted upon said machine and extending within the path of travel of the overlapping edges of the paper passing therethrough, and a heater adjustably mounted upon said machine a't a point above said xed heater.

4. The combination with a paper bag making machine having means for overlapping the 105 edges of the paper as the latter passes through the machine, of a heater fixedly mounted upon said machine and adapted to contact with one side of the overlapping edges of the paper; and a heater adjustably mounted upon said machine 110 and adapted to contact with the opposite sides of the overlapping edges of the paper. r

5. 'I'he combination with a wax paper bag making machine having means for overlapping the edges of the paper as the latter passes through the machine, of a heater for causing the overlapping edges of waxed paper to be united together` comprising a relatively long tube, a heating element Within said tube, and said tube being arranged upon the machine to 'extend in a longitudinal direction with the overlapping edges oi thewaxed paper and disposed to merely touch the same whereby said overlapping edges of the paper may be united without the application of pressure'. 125

STUART MOORE. 

